[Healeys] Overdrive Question

Richard Pratt prattri at msn.com
Wed Nov 9 14:03:22 MST 2016


Roger,
The work shop manual requires .008” to .012” thrust clearance of the components from the annuls  to the control value housing. If the clearance is not correct than you replace the steel spacer with one of the correct thickness. If you than install gaskets then you have increased the thrust clearance by the thickness of two gaskets.
Richard

From: Healeys [mailto:healeys-bounces at autox.team.net] On Behalf Of Roger Grace
Sent: Tuesday, November 08, 2016 11:04 AM
To: Michael Salter <michaelsalter at gmail.com>; Healey List <healeys at autox.team.net>
Subject: Re: [Healeys] Overdrive Question

Tks to all for good input.
Wondering if anyone has thoughts why factory never installed a gasket at this flange joint ?
Any negatives about retro-fitting one after 50 years ?
rg


From: Michael Salter
Sent: Sunday, November 6, 2016 9:38 AM
To: Healey List
Subject: Re: [Healeys] Overdrive Question

Out of interest I just did the calculations for the change in length of the studs in this case.
Assuming:
4 x 5/16" dia studs with an effective diameter of 0.25" each (thread root) and a length of 3" (in actual fact only the bottom pair are that long).
0.8 G of braking (which is probably way higher than our tires can generate)
Young's Modulus of 30,000,000 @ 100 degrees F
700 lbs of engine and gearbox (which is probably very high considering that the the mounts are all rubber and the main engine mounts would absorb a fair bit as well)
Works out to about 0.00028" of stretch.
That's less than 10% of a human hair and only during panic braking if the tie rod is the only thing resisting the load.
I think that there must be other contributing factors...
Michael S
BN1 #174

On Sun, Nov 6, 2016 at 11:19 AM, Bluehealey <bluehealey at gmail.com> wrote:
Team.
I can agree that a good goo between the mating faces is important and the Japanese Motorcycle manufacturers will probably have the solution nailed.  The root cause however isn’t necessarily pressure, flange flatness, or goo failure.
It is more likely that the rear reaction strut (not sure what else to call it) causes the joint to flex a little and open every time the car slows under braking.  My theory and the solution I adopted can be found here:
http://www.bluehealey.com/Struts.html
No leaks from my gearbox.

AlanB
[cid:image001.png at 01D18856.FC90FB60]


From: Healeys [mailto:healeys-bounces at autox.team.net] On Behalf Of Roger Grace
Sent: 05 November 2016 21:02
To: David Porter; Healey List

Subject: Re: [Healeys] Overdrive Question

Sorry to reopen this, but have this same leak in my BJ8 OD and fixing it is one of my Winter projects.
Given that the black sealant stuff that was used before didn’t last (have no idea how long ago or what it is) and that there is no oil pressure on the joint, am sensitive to using what is the appropriate goo that will last and contain the oil.
Have done some checking around and the Hylomar universal blue is used by some shops that fix OD’s.
Overdrive Services (ex Laycock people in UK) tell me that the originals were sealed with a product called Wellseal.
Nowadays they use a Wurth sealant that mentions flange mating in its website blurb.
BTW they said that they could supply me with a gasket for this joint that seems like a good idea ?

The reality is that these are 2 Al flanges that are mated without a gasket. I wonder why ?. Plan to do some careful flatness checking when have my hands on them.  Has anyone had a problem with the mating flatness ?  do they have a tendency to warp over the years and maybe abuse too ? given the shape not easy to machine flat - why do they leak ?

Comments/ideas please.
rg


From: David Porter
Sent: Wednesday, October 26, 2016 7:15 AM
To: Bob Spidell ; John Spaur
Cc: healeys
Subject: Re: [Healeys] Overdrive Question


seems like any RTV that is oil compliant will work. There is no internal pressure that will force oil out. The oil level in the OD is just above the operating shaft level, hence the need for the o-rings on the shaft.

DaveP adding to the wisdom....

On 10/26/2016 7:40 AM, Bob Spidell wrote:
Soooooooo ... both types of Hylomar WILL seal the joint?


________________________________
From: "John Spaur" mailto:jmsdarch at sbcglobal.net
To: "WILLIAM B LAWRENCE" mailto:YNOTINK at msn.com, "healeys" mailto:healeys at autox.team.net
Sent: Tuesday, October 25, 2016 8:27:53 PM
Subject: Re: [Healeys] Overdrive Question

In my experiences neither of the two types Hylomar will not seal that joint.

John Spaur
San Jose

From: Healeys [mailto:healeys-bounces at autox.team.net] On Behalf Of WILLIAM B LAWRENCE
Sent: Sunday, October 23, 2016 8:26 PM
To: healeys at autox.team.net
Subject: [Healeys] Overdrive Question


…disassembly of the OD because it is seeping oil at the clutch ring. There are no gaskets, but I would like to smear some Hylomar on the joint faces to stop the leak.

_______________________________________________





_______________________________________________

Support Team.Net http://www.team.net/donate.html

Suggested annual donation  $12.75

Archive: http://www.team.net/archive

Forums: http://www.team.net/forums



Healeys at autox.team.net

http://autox.team.net/mailman/listinfo/healeys



Unsubscribe/Manage: http://autox.team.net/mailman/options/healeys/frogeye@porterscustom.com



--
Dave Porter Porter Custom Bicycles 2909 Arno St. NE Albuquerque, NM 87107 505-352-1378<tel:505-352-1378> Go HERE: my world www.porterbikes.com/<http://www.porterbikes.com/>
________________________________
_______________________________________________
Support Team.Net http://www.team.net/donate.html
Suggested annual donation  $12.75
Archive: http://www.team.net/archive
Forums: http://www.team.net/forums

Healeys at autox.team.net
http://autox.team.net/mailman/listinfo/healeys

Unsubscribe/Manage: http://autox.team.net/mailman/options/healeys/roggrace@telus.net
________________________________

No virus found in this message.
Checked by AVG - www.avg.com<http://www.avg.com>
Version: 2015.0.6201 / Virus Database: 4664/13278 - Release Date: 10/26/16

________________________________
[Image removed by sender. Avast logo]<https://www.avast.com/antivirus>


This email has been checked for viruses by Avast antivirus software.
www.avast.com<https://www.avast.com/antivirus>



_______________________________________________
Support Team.Net http://www.team.net/donate.html
Suggested annual donation  $12.75
Archive: http://www.team.net/archive
Forums: http://www.team.net/forums

Healeys at autox.team.net
http://autox.team.net/mailman/listinfo/healeys

Unsubscribe/Manage: http://autox.team.net/mailman/options/healeys/michaelsalter@gmail.com




--
If you can't fix it with a hammer, you've got an electrical problem.
________________________________
_______________________________________________
Support Team.Net http://www.team.net/donate.html
Suggested annual donation  $12.75
Archive: http://www.team.net/archive
Forums: http://www.team.net/forums

Healeys at autox.team.net
http://autox.team.net/mailman/listinfo/healeys

Unsubscribe/Manage: http://autox.team.net/mailman/options/healeys/roggrace@telus.net
________________________________

No virus found in this message.
Checked by AVG - www.avg.com<http://www.avg.com>
Version: 2015.0.6201 / Virus Database: 4664/13359 - Release Date: 11/06/16
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://autox.team.net/pipermail/healeys/attachments/20161109/bd93bfc4/attachment.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image002.png
Type: image/png
Size: 25239 bytes
Desc: image002.png
URL: <http://autox.team.net/pipermail/healeys/attachments/20161109/bd93bfc4/attachment.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image003.jpg
Type: image/jpeg
Size: 524 bytes
Desc: image003.jpg
URL: <http://autox.team.net/pipermail/healeys/attachments/20161109/bd93bfc4/attachment.jpg>


More information about the Healeys mailing list